Drive shaft FHG series

precisionwith flangeinput

Introduction
The FHG-IV series harmonic drive is an input-shaft configured unit with an integrated sealed-flange structure. The assembly is pre-filled with specialized lubricating grease and incorporates a high-rigidity cross roller main bearing to simplify equipment integration and increase structural rigidity. Typical output configurations are fixed circular spline + flexspline output or fixed flexspline + circular spline output.

Key features

• Input-shaft design with multiple connection options (timing pulley or gear-shaft)
• Fully sealed flange unit pre-filled with specialized grease
• Integrated high-rigidity cross roller main bearing
• High-precision rotation and accurate positioning; inline input/output alignment
• High torque capacity with defined moment and load limits

Technical data — Starting torque (unit: cNm)
Reduction ratios: 11, 14, 17, 20, 25, 32, 40. Examples (starting torque in cNm by size):
Size 50: — | 14: 8.8 | 17: 27 | 20: 36 | 25: 56 | 32: 85 | 40: 136
Size 80: — | 14: 7.5 | 17: 25 | 20: 33 | 25: 50 | 32: 74 | 40: 117
Size 100: — | 14: 6.9 | 17: 24 | 20: 32 | 25: 49 | 32: 72 | 40: 112
Size 120: — | 14: 6.9 | 17: 24 | 20: 31 | 25: 48 | 32: 68 | 40: 110
Size 160: — | — | — | 20: 31 | 25: 47 | 32: 67 | 40: 105

Moment / load limits
FHG-14: Mbdi 41 Nm; Mb max 80 Nm; Ftdi 270 N; Ft max 490 N; Fa di 270 N; Fa max 490 N
FHG-17: Mbdi 72 Nm; Mb max 140 Nm; Ftdi 400 N; Ft max 700 N; Fa di 400 N; Fa max 700 N
FHG-20: Mbdi 140 Nm; Mb max 280 Nm; Ftdi 650 N; Ft max 1150 N; Fa di 650 N; Fa max 1150 N
FHG-25: Mbdi 243 Nm; Mb max 480 Nm; Ftdi 900 N; Ft max 1600 N; Fa di 900 N; Fa max 1600 N
FHG-32: Mbdi 460 Nm; Mb max 900 Nm; Ftdi 1350 N; Ft max 2300 N; Fa di 1350 N; Fa max 2300 N
FHG-40: Mbdi 600 Nm; Mb max 1200 Nm; Ftdi 2000 N; Ft max 3500 N; Fa di 2000 N; Fa max 3500 N

Performance highlights
Examples from performance tables (rated torque at 2000 r/min input, permissible peak torque, permissible average-load torque, max input speeds, backlash and design life):
- Reduction ratio 14: rated torque ~7–10 Nm (depending on size); peak torque ~23–36 Nm; max input speed (grease) up to 15000 r/min for compact sizes; backlash ≤20 arcsec; reference design life ≈10000 h.
- Reduction ratio 17: rated torque up to ~31 Nm; peak torque up to ~70 Nm; max input speed up to 15000 r/min for selected sizes.
- Reduction ratio 20: rated torque up to ~52 Nm (larger sizes higher); typical max input speeds vary by size (e.g., 6500–15000 r/min).
- Higher ratios (25, 32, 40): rated and peak torques increase with model size; permissible max input speed generally decreases for larger sizes (examples: 5600 r/min for some 25 series; 4800 r/min for 32; 4000 r/min for 40).

Applications & selection guidance

• Suitable for precision rotary drives requiring compact high-ratio reduction with inline shaft alignment (robotics, machine tools, automation equipment).
• Select model and reduction ratio based on continuous torque requirement, peak torque at start/stop, radial/axial load limits and input speed.
• Refer to the detailed numerical tables for exact values per model/reduction ratio and to variant coefficients (FHG-I…FHG-V) when calculating life and performance.

Models / variants

• Available sizes: FHG-14, FHG-17, FHG-20, FHG-25, FHG-32, FHG-40
• Series designation: FHG-IV (input-shaft, sealed-flange integrated structure)